Mechanism based inhibitors of diaminopimelate aminotransferase (DAP-AT) were designed using knowledge of its substrate specificity and mechanism. Synthesis of thiolester and amide substrate analogues was achieved prior to in vitro inhibition studies, but ester analogues proved too unstable to isolate. Thia substrate analogues showed no inhibitory properties, but the aza substrate analogue 12a showed reversible inhibition vs. DAP-AT and time dependent inhibition in the absence of the natural substrate 4. Substrate analogue 12a is the first example of an amide inhibitor of PLP dependent enzymes. Antibiotic properties of 12a were also briefly assessed.
基于对二
氨基
庚二酸转
氨酶(DAP-AT)的底物特异性及作用机制的了解,设计了机制型
抑制剂。在体外抑制实验之前,成功合成了
硫酯及酰胺类底物类似物,但
酯类类似物过于不稳定,无法分离。
硫类底物类似物未表现出抑制作用,但氮类底物类似物12a对DAP-AT显示出可逆抑制性,并且在缺乏天然底物4的情况下显示出时间依赖性抑制作用。底物类似物12a是首个PLP依赖性酶的酰胺类
抑制剂示例。同时,也对12a的抗菌特性进行了简要评估。